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Perl is used extensively as a system programming language in the Debian Linux distribution. [132] Perl is often used as a glue language, tying together systems and interfaces that were not specifically designed to interoperate, and for "data munging", [133] that is, converting or processing large amounts of data for tasks such as creating ...
#!/usr/bin/perl – called the "shebang line", after the hash symbol (#) and ! (bang) at the beginning of the line. It is also known as the interpreter directive. # – the number sign, also called the hash symbol. In Perl, the # indicates the start of a comment. It instructs perl to ignore the rest of the line and not execute it as script code.
Few languages ever become sufficiently popular that they are used by more than a few people, but professional programmers may use dozens of languages in a career. Most programming languages are not standardized by an international (or national) standard, even widely used ones, such as Perl or Standard ML (despite the name).
(Note that, on Microsoft Windows systems, Perl programs are typically invoked by associating the .pl extension with the Perl interpreter. In order to deal with such circumstances, perl detects the shebang line and parses it for switches. [4]) The second line in the canonical form includes a semicolon, which is used to separate statements in Perl.
Perl. Block comments in Perl are considered part of the documentation, and are given the name Plain Old Documentation (POD). Technically, Perl does not have a convention for including block comments in source code, but POD is routinely used as a workaround. PHP. PHP supports standard C/C++ style comments, but supports Perl style as well. Python
The PDL API uses the basic Perl 5 object-oriented functionality: PDL defines a new type of Perl scalar object (eponymously called a "PDL", or "ndarray") that acts as a Perl scalar, but that contains a conventional typed array of numeric or character values. All of the standard Perl operators are overloaded so that they can be used on PDL ...
Wall developed the Perl interpreter and language while working for System Development Corporation, which later became part of Burroughs and then Unisys. [5] He is the co-author of Programming Perl (often referred to as the Camel Book and published by O'Reilly), which is the definitive resource for Perl programmers; and edited the Perl Cookbook.
The effect of Perl modules are usually limited to the current scope in which it was loaded. It is common for Perl modules to have embedded documentation in Perl's Plain Old Documentation format. POD imposes little structure on the author. It is flexible enough to be used to write articles, web pages and even entire books such as Programming Perl.